3+3=
8+4=
9+9=
4+13=
40+5=
22+40=
4-4=
10-3=
13-6=
28-4=
43-20=
100-30=
15+6=
12+18=
25-12=

+10=14-5
-2=20-14
+3+=18
12--=3
5+=-10
8+9-7-8=
11-=+3
3+9+2+7=